Nested join Query

Nested join Query



I have a SQL query:


SELECT a.LAN_ABBR, a.COUNTRY, a.CITY, a.SITE, a.Address,
c.Network_Priority, c.Dedicated_Network, c.Other_Network,
c.LAN_One, c.LAN_two, c.LAN_three,
c.LAN_four, c.LAN_five, c.LAN_six, c.LAN_seven,
b.Remark
FROM server_data a
LEFT OUTER JOIN site_remark b ON a.SITE = b.SITE_ABBR
INNER JOIN lan_service c ON a.LAN_ABBR = c.LAN;



This Query is giving me output:


LAN_ABBR || COUNTRY || CITY || SITE || Address || Network_Priority || Dedicated_Network || Other_Network || LAN_One|| LAN_two || LAN_three || LAN_four || LAN_five || LAN_six || LAN_seven || Remark
==================================================================================================================================================================================================================
ABC1 || India || Delhi|| XYZ1 || Delhi 1 || yes || no || no || yes || no || yes || yes || yes || no || no || Delhi Network 1
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ABC2 || India || Delhi|| XYZ1 || Delhi 1 || no || no || yes || no || yes || no || no || no || yes || no || Delhi Network 1
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ABC3 || India || Delhi|| XYZ1 || Delhi 1 || yes || no || no || yes || no || no || no || no || no || no || Delhi Network 1
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ABC4 || India || Delhi|| XYZ2 || Delhi 1 || yes || no || yes || no || yes || no || no || no || yes || yes || Delhi Network 4
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



I want a result which looks like:


COUNTRY || CITY || SITE || Address || Network_Priority || Dedicated_Network || Other_Network || LAN_One|| LAN_two || LAN_three || LAN_four || LAN_five || LAN_six || LAN_seven || Remark
==================================================================================================================================================================================================================
India || Delhi|| XYZ1 || Delhi 1 || yes || no || yes || yes || yes || yes || yes || yes || yes || no || Delhi Network 1
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

India || Delhi|| XYZ2 || Delhi 1 || yes || no || yes || no || yes || no || no || no || yes || yes || Delhi Network 4
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Logic:


If a.Site has a duplicate entry



check(

c.Network_Priority (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.Dedicated_Network (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.Other_Network (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_One (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_two (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_three (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_four (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_five (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_six (Single entry for yes no: If even single "yes" then complete "yes" else "no"),

c.LAN_seven (Single entry for yes no: If even single "yes" then complete "yes" else "no"),





2 Answers
2



You can try to use MAX and MIN function to get your expect result.


MAX


MIN


SELECT a.COUNTRY,
a.CITY,
a.SITE,
a.Address,
MAX(c.Network_Priority),
MAX(c.Dedicated_Network),
MAX(c.Other_Network),
MAX(c.LAN_One),
MAX(c.LAN_two),
MAX(c.LAN_three),
MAX(c.LAN_four),
MAX(c.LAN_five),
MAX(c.LAN_six),
MAX(c.LAN_seven),
MIN(b.Remark) Remark
FROM server_data a
LEFT OUTER JOIN site_remark b ON a.SITE = b.SITE_ABBR
INNER JOIN lan_service c ON a.LAN_ABBR = c.LAN
GROUP BY a.COUNTRY,a.CITY,a.SITE,a.Address



Here is a simple


CREATE TABLE T(
LAN_ABBR VARCHAR(50),
COUNTRY VARCHAR(50),
CITY VARCHAR(50),
SITE VARCHAR(50),
Address VARCHAR(50),
Network_Priority VARCHAR(50),
Dedicated_Network VARCHAR(50),
Other_Network VARCHAR(50),
LAN_One VARCHAR(50),
LAN_two VARCHAR(50),
LAN_three VARCHAR(50),
LAN_four VARCHAR(50),
LAN_five VARCHAR(50),
LAN_six VARCHAR(50),
LAN_seven VARCHAR(50),
Remark VARCHAR(50)
);

INSERT INTO T VALUES ('ABC1','India','Delhi','XYZ1','Delhi 1','yes','no','no','yes','no','yes','yes','yes','no','no','Delhi Network 1');
INSERT INTO T VALUES ('ABC2','India','Delhi','XYZ1','Delhi 1','no','no','yes','no','yes','no','no','no','yes','no','Delhi Network 1');
INSERT INTO T VALUES ('ABC3','India','Delhi','XYZ1','Delhi 1','yes','no','no','yes','no','no','no','no','no','no','Delhi Network 1');
INSERT INTO T VALUES ('ABC4','India','Delhi','XYZ2','Delhi 1','yes','no','yes','no','yes','no','no','no','yes','yes','Delhi Network 4');



Query 1:


SELECT COUNTRY,
CITY,
SITE,
Address,
MAX(Network_Priority) Network_Priority,
MAX(Dedicated_Network) Dedicated_Network,
MAX(Other_Network) Other_Network,
MAX(LAN_One) LAN_One,
MAX(LAN_two) LAN_two,
MAX(LAN_three) LAN_three,
MAX(LAN_four) LAN_four,
MAX(LAN_five) LAN_five,
MAX(LAN_six) LAN_six,
MAX(LAN_seven) LAN_seven,
MIN(Remark) Remark
FROM T
GROUP BY COUNTRY,CITY,SITE,Address



Results:


| COUNTRY | CITY | SITE | Address | Network_Priority | Dedicated_Network | Other_Network | LAN_One | LAN_two | LAN_three | LAN_four | LAN_five | LAN_six | LAN_seven | Remark |
|---------|-------|------|---------|------------------|-------------------|---------------|---------|---------|-----------|----------|----------|---------|-----------|-----------------|
| India | Delhi | XYZ1 | Delhi 1 | yes | no | yes | yes | yes | yes | yes | yes | yes | no | Delhi Network 1 |
| India | Delhi | XYZ2 | Delhi 1 | yes | no | yes | no | yes | no | no | no | yes | yes | Delhi Network 4 |



NOTE



this query assumes there is only three two type in your columns 'yes' or 'no'.


'yes'


'no'



If there are other states in your columns,you can try to use condition aggregate function


SELECT COUNTRY,
CITY,
SITE,
Address,
MAX(Network_Priority) Network_Priority,
MAX(CASE WHEN Dedicated_Network='yes' then 'yes' else 'no' end) Dedicated_Network,
MAX(CASE WHEN Other_Network='yes' then 'yes' else 'no' end) Other_Network,
MAX(CASE WHEN LAN_One='yes' then 'yes' else 'no' end) LAN_One,
MAX(CASE WHEN LAN_two='yes' then 'yes' else 'no' end) LAN_two,
MAX(CASE WHEN LAN_three='yes' then 'yes' else 'no' end) LAN_three,
MAX(CASE WHEN LAN_four='yes' then 'yes' else 'no' end) LAN_four,
MAX(CASE WHEN LAN_five='yes' then 'yes' else 'no' end) LAN_five,
MAX(CASE WHEN LAN_six='yes' then 'yes' else 'no' end) LAN_six,
MAX(CASE WHEN LAN_seven='yes' then 'yes' else 'no' end) LAN_seven,
MIN(Remark) Remark
FROM T
GROUP BY COUNTRY,CITY,SITE,Address



You may use the following with grouping by a.COUNTRY, a.CITY, a.SITE, a.Address, b.Remark, and use max() for related cases as follows :


a.COUNTRY, a.CITY, a.SITE, a.Address, b.Remark


max()


SELECT a.COUNTRY, a.CITY, a.SITE, a.Address,
(case when max(c.Network_Priority)='yes' then
else 'no'
end) as Network_Priority,
(case when max(c.Dedicated_Network)='yes' then
else 'no'
end) as Dedicated_Network,
(case when max(c.Other_Network)='yes' then
else 'no'
end) as Other_Network,
(case when max(c.LAN_one)='yes' then
else 'no'
end) as LAN_one,
(case when max(c.LAN_two)='yes' then
else 'no'
end) as LAN_two,
(case when max(c.LAN_three)='yes' then
else 'no'
end) as LAN_three,
(case when max(c.LAN_four)='yes' then
else 'no'
end) as LAN_four,
(case when max(c.LAN_five)='yes' then
else 'no'
end) as LAN_five,
(case when max(c.LAN_six)='yes' then
else 'no'
end) as LAN_six,
(case when max(c.LAN_seven)='yes' then
else 'no'
end) as c.LAN_seven,
b.Remark
FROM server_data a
LEFT OUTER JOIN site_remark b
ON a.SITE = b.SITE_ABBR
INNER JOIN lan_service c
ON a.LAN_ABBR = c.LAN
GROUP BY a.COUNTRY, a.CITY, a.SITE, a.Address, b.Remark;



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